In the title compound, [HgI(2)(C(23)H(14)N(4)O)], the Hg(II) atom is four-coordinated by two N atoms from one 1-(1H-imidazo[4,5-f][1,10]phenanthrolin-2-yl)naphthalen-2-ol ligand and by two I atoms in a distorted tetra-hedral environment. An intra-molecular O-H⋯N hydrogen bond stabilizes the mol-ecular conformation and an inter-molecular N-H⋯I inter-action stabilizes the crystal packing.